<template>
  <div class="chartNum">
    <div class="box-item">
      <li
        :class="{ 'number-item': !isNaN(item), 'mark-item': isNaN(item) }"
        v-for="(item, index) in orderNum"
        :key="index"
      >
        <span v-if="!isNaN(item)">
          <i ref="numberItem">0123456789</i>
        </span>
        <span class="comma" v-else>{{ item }}</span>
      </li>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      orderNum: ["0", "0", "0", "0", "0", "0", "0", "0"], // 默认订单总数
      // 控制数字更新s
      changenub: "12654",
    };
  },
  mounted() {
      setTimeout(() => {
        this.toOrderNum(this.changenub);
      }, 500);

  },
  methods: {
    // 设置文字滚动
    setNumberTransform() {
      const numberItems = this.$refs.numberItem; // 拿到数字的ref，计算元素数量
      const numberArr = this.orderNum.filter((item) => !isNaN(item));
      // 结合CSS 对数字字符进行滚动,显示数量
      for (let index = 0; index < numberItems.length; index++) {
        const elem = numberItems[index];
        elem.style.transform = `translate(-50%, -${numberArr[index] * 10}%)`;
      }
    },
    // 处理数字
    toOrderNum(num) {
      num = num.toString();
      if (num.length < 8) {
        num = "0" + num; // 如未满八位数，添加"0"补位
        this.toOrderNum(num); // 递归添加"0"补位
      } else {
        // 加入逗号
        // num = num.slice(0, 2) + ',' + num.slice(2, 5) + ',' + num.slice(5, 8)
        this.orderNum = num.split(""); // 将其便变成数据，渲染至滚动数组
      }
      this.setNumberTransform();
    },
  },
};
</script>
<style scoped>
/*滚动数字设置*/
.box-item {
  position: relative;
  height: 100px;
  font-size: 54px;
  line-height: 41px;
  text-align: center;
  list-style: none;
  color: #2d7cff;
  writing-mode: vertical-lr;
  text-orientation: upright;
  /*文字禁止编辑*/
  user-select: none;
  /* overflow: hidden; */
}
/* 默认逗号设置 */
.mark-item {
  width: 10px;
  height: 100px;
  margin-right: 5px;
  line-height: 10px;
  font-size: 48px;
  position: relative;
}
.mark-item > span {
  position: absolute;
  width: 100%;
  bottom: 0;
  writing-mode: vertical-rl;
  text-orientation: upright;
}
/*滚动数字设置*/
.number-item {
  width: 41px;
  height: 75px;
  /* 背景图片 */
  background-color: rgb(14, 3, 3);
  background-size: 100% 100%;
  /* // background: #ccc; */
  list-style: none;
  margin-right: 5px;
  /* // background:rgba(250,250,250,1); */
  border-radius: 4px;
  border: 1px solid rgba(221, 221, 221, 1);
}
.number-item > span {
  position: relative;
  display: inline-block;
  margin-right: 10px;
  width: 100%;
  height: 100%;
  writing-mode: vertical-rl;
  text-orientation: upright;
  overflow: hidden;
}
.number-item > span > i {
  font-style: normal;
  position: absolute;
  top: 11px;
  left: 50%;
  transform: translate(-50%, 0);
  transition: transform 1s ease-in-out;
  letter-spacing: 10px;
}
.number-item:last-child {
  margin-right: 0;
}
</style>
